How Much Caffeine Is in Monster?

A standard 16 oz can of Monster Energy has 160 mg of caffeine. Most of the Monster range sits close to that: Juice Monster and Monster Rehab also have about 160 mg, while Monster Ultra has 140 to 155 mg and Monster Lo-Carb has 140 mg. The big exception is Monster Killer Brew, with 300 mg in a 15 oz can.

So “how much caffeine is in a Monster?” depends on which Monster you’re holding. Here’s every main line, how it compares to coffee, and how many cans fit within the FDA’s daily guideline.

Caffeine in Every Monster Line

Most Monster cans have 140 to 160 mg of caffeine, but the coffee-based Java Monster and Killer Brew have far more.

Caffeine figures from Caffeine Informer and its Monster Rehab page, plus Monster Energy for Lo-Carb and the H-E-B label for Lando Norris. Juice Monster flavors can vary a little, so check each can’s label. Prices checked at DrinkWorlds in November 2026.

Want the breakdown for each Ultra flavor, from Strawberry Dreams to Sunrise? See how much caffeine is in Monster Ultra.

Watch Out for Killer Brew

Killer Brew deserves its own warning. At 300 mg, one 15 oz can has nearly twice the caffeine of a regular Monster and three-quarters of the FDA’s 400 mg daily guideline. It’s sold in the coffee aisle and tastes like an iced mocha, which makes it easy to treat like a regular coffee. It isn’t.

If you’re used to green-can Monster, think of one Killer Brew as roughly two cans.

Monster vs Coffee, Tea and Soda

A regular Monster has about the same caffeine as a 12 oz cup of brewed coffee at the low end of the range.

Coffee, tea, soda and energy drink ranges from the FDA.

How Many Monsters Can You Drink a Day?

The FDA cites 400 mg a day as an amount not generally linked to dangerous or negative effects for healthy adults (FDA). Here’s how that works out:

In practice, two regular Monsters a day is the most a healthy adult should plan on, and less if you also drink coffee, tea or soda. Every source counts toward the same 400 mg.

The FDA also notes that people react to caffeine differently. Signs you’ve had too much include a fast heartbeat, jitters, anxiety, trouble sleeping, an upset stomach and headaches. If you’re pregnant or breastfeeding, the FDA suggests asking your doctor about caffeine. Pediatric experts advise against energy drinks for children and teens.

Lower-Caffeine Monster Options

If you like Monster but want a little less caffeine:

• Monster Lo-Carb has 140 mg and only 30 calories (Monster Energy). Shop the Lo-Carb 15-pack.
• Monster Ultra Red, Violet and Paradise have 140 mg and zero sugar. Shop Ultra Red.
• Monster Lando Norris Zero Sugar has 145 mg and 5 calories. Shop the 15-pack.

FAQs

How much caffeine is in a 16 oz Monster?

A 16 oz can of original Monster Energy has 160 mg of caffeine. Monster Zero Sugar and Juice Monster also have about 160 mg.

Which Monster has the most caffeine?

Monster Killer Brew, with 300 mg in a 15 oz can. Java Monster has 200 mg, and a 24 oz Mega Monster has 240 mg.

Which Monster has the least caffeine?

Among the main lines, Monster Lo-Carb and some Ultra flavors (Red, Violet, Paradise) have the least, at 140 mg per 16 oz can.

Does a Monster have more caffeine than coffee?

Not usually. A 16 oz Monster has 160 mg, while a 12 oz brewed coffee can have 113 to 247 mg, according to the FDA. Killer Brew, at 300 mg, is the exception.

Is it safe to drink two Monsters a day?

For most healthy adults, two 160 mg cans (320 mg) stay under the FDA’s 400 mg guideline, as long as you don’t have much other caffeine that day.

How much caffeine is in Monster Rehab?

Most Monster Rehab flavors have 160 mg per 15.5 oz can. Rehab Green Tea has 155 mg.

The Bottom Line

Most Monster energy drinks have 140 to 160 mg of caffeine per can, about the same as a cup of coffee. The one to watch is Killer Brew, at 300 mg. Keep your total under 400 mg a day from all sources, and two cans is a sensible limit.

Shop Monster energy drinks by the case at DrinkWorlds → Fresh 12- and 15-packs, free US shipping on orders over $35.